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An explanation of the gnomonic projection of the sphere : and of such points of astronomy as are most necessary in the use of astronomical maps: being a description of the construction and use of the larger and smaller maps of the stars; as also of the six maps of the earth / By August De Morgan ...

An explanation of the gnomonic projection of the sphere; and of such points of astronomy as are most necessary in the use of astronomical maps: being a description of the construction and use of the larger and smaller maps of the stars; as also of the six maps of the earth. By August De Morgan ...

The comet. Scientific notices of comets in general, and in particular of the comet of 1832, whose revolution is of six years and three quarters' duration. By M. Arago ... Tr. from the French by Colonel Charles Gold ...